Handpiece for dental machines.



W. T. LYON.

HANDPIECE FOR DENTAL MACHINES. APPLICATION FILED SEPT. 15. 1914. IIENEWED AUG. 7.1916.

1,204,800. Patented Nov. 14, 1916.

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WILLIAM T. LYON, or PORTLAND, oancoN, AssrGNoR To THE INTERNATIONAL DENTAL-APPLIANCE co., or PORTLAND, OREGON.

HANDPIECE FOR DENTAL MACHINES.

Lacasse.

Specification of Letters Patent.

Patented Nov. 14, 1916.

Application mea' september 15, 1914,'se1-ia1No. 861,861. Renewed August 7, 1916. serial No. 113,616.

/ '0 all 'whom t may concern.'

Be it known that I, VVTLLIAM T. LYON, residing in Portland, in the county of Multnomah and State of Oregon, haver invented certain new and useful Improvements in I-Iandpieces for Dental Machines, of which the following is a specication. l

My invention is an improved hand piece for dental machines of the type disclosed in my Patent Number 987 7 82, issued March 28, 1911 and in its general nature the invention comprises an improved construction of parts designed to reduce the cost of manufacture and to render the device more edective in its operation. y v

Grenerically the invention44 comprises an outer casing in which a hollow shaft is rotatable, Ythe holl'ow shaft having an internally threaded portion adjacent to Vthe front end to coperate with the threaded end of a thrust rod that functions to force kthe chuck into its tool gripping position, the rod being moved by external instrumentalities to effect the adjustments and the chuck being'l'ocated wholly within the rotatable shaft.

In its more rdetailedV nature, the invention includes y those novel features of construction, combination, and arrangement of parts, all of which will be first fully described,

then be specifically pointed out in the ap-` Vgitudinal section of a portion of a modified form adapted for flexible drive. FigQG is a cross section on the line 6-6 of Fig. 5.

In the drawing in which like numerals and letters of reference designate like parts in all of the figures, 1 represents the outer casing which is coned at its forward end as at 2 and is provided with aV nib 3 for convenience in securing angle attachments (not shown). c

The casing 1 is slotted at its inner end, as at l, to receive a thumb screw 5 by which the casing is secured to the support or bearine member 7, inte which member the thumb,

screw 5 is tapped as at 6. The support or bearing member 7 has an annular groove 8 "to receive the clamp screw 10 of the clamp head 9 of the supporting bracket 11, when a belt drive is employed. The clamp head 9 is secured tightly on the bearing or supportingmember 7 and holds the same relatively rigid. c Y jA 12 designates the swivel joint carrying the idler pulleys 'around which the endless driv- 'mg belt 13 passes.

141` is an oiling aperture in the bearing member 7 to convey lubricantto the bearing surface ofthe hollow shaft 15. rlhe hollow shaft 15 has a collar 1G that preferably has a tapering fit at 1 7 with the'bea'ring 7 and the hollow shaft 15 includes a bearing end 21 that projects through the bearing 7 and carries the drive pulley 18 which is secured to the bearing end 21 by aset Lscrew 19 so as to abut the bearing 7 and take up end play. The pulley 18 has a milled periphery 20 by means of which the pulley may be grasped to hold the shaft from turning during the manipulation of the milled head 23 to turn the thrust rod 22. Y

The hollow shaft 15 is internally threaded at 24: to be engaged by the threaded portion 25 of the rod 22 whereby the rod 22 may be forced forwardly with its end 26 against the rear end of the chuck 27 to force the split end 28 of the chuck against the internally coned surface 29 of the shaft 15 and cause the chuck to grip the tool 30. Thus it will be seen that by simply screwing or unscrewing the rod 22, the tool 80 will be gripped or released accordingly.`V

In theform shown in Fig. 5,.the thrust rod 22a is not provided with the threads 25 and the hollow shaft 15 is not provided with the threads 24;, but the function of these parts is performed by other means. Inthis modified form, the'bearing mem-ber 7a is provided with the thumb screw 5 by which the casing 1 is secured in the Vsame manner as before and in addition the bearing 7a supports a sleeve 30 which has a slot 31 and is provided with a thumb screw 32 similar to the screw 5 and for a similar purpose; the slot 81 being Y ber. The half clutch member 33 is secured at 34 to the hollow shaft end 21 and it. cooperates with a second half clutch member 36 which is mounted within the sleeve 30 and the clutch member 33 is adapted to be shifted into and out of engagement with the half clutch member 36 by longitudinal movement of the button The sleeve 30, is milled at 39 to afford a convenient grip. The sleeve 30 has a projection 38 which is threaded to receive the threaded cap 40 of the flexible drive shaft tubev 43, thev drive shaft 42, that is mounted in the tube being secured to the stem 4l of the half clutch member 36.

When the parts are in the position shown in Fig. 5, the thrust rod 22a projects into the pocket 37 of the half clutch member 36 and the end is engaged-thereby to hold the rod 222L rigid to allow the button 305' to shift the sleeve 15 to its chuck moving position to grip the tool, but when the button 30y is pulled forwardly to disengage the clutch members 36 and 33, the pressure on the rod 22a is released with the result that the tool may be removed from the chuck.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the complete construction, operation and advantages of my invention will be clear to those skilled in the art to which it appertains.

What I claim is l. In a dental hand piece, a bearing member, an outer shell or casing secured thereto and having a tool opening in its front end, a hollow shaft rotatable in said shell and projecting through said bearing member, said hollow shaft having its outer end internally coned and apertured to receive the tool, a chuck in said hollow shaft adjacent to said coned end, a thrust rod in said hollow shaft, and means for eectng a thrust action of said rod to force said chuck into its gripping position.

2. In a dental hand piece, a bearing member, an outer shell or casing secured thereto and having a tool opening in its front end, a hollow shaft rotatable in said shell and projecting through said bearing member, said hollow shaft having its outer end internally coned and apertured to receive the tool, a chuck in said hollow shaft adjacent to said coned end, a thrust rod in said hollow shaft, i

said hollow shaft having an internalthread and said thrust rod having an external thread to engage said internal thread, said rod projecting to the outside of said shaft and having a member by which it may be turned.

WILLIAM T. LYON. Witnesses:

A. T. LEWIS, ARTHUR LEWIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of `IlEatents, AWashington, D. G. 

